Is there anyway you can tell me how to do that xhomer and I'll give it a try I have never done anything like that before iv always kept everything as simple as I can and have had no problems
My friend has suggested I use electrum is that easy enough to use for a newbie lol thanks again guys
Yes, you can do exactly as he said - but I think you will just duplicate what we have already done.
1) Type your 12 words into this web site: https://dcpos.github.io/bip39/ in the BIP39 Mnemonic box
2) Once it accepts the 12 words, scroll down to the box that says "BIP32 Extended Key (addresses only)" that is where your xpub is.
Check this xpub. Since we basically did the same thing when we typed your 12 words back into a new account a blockchain.info I will bet the xpub you get will be the same, it will probably be this one
http://imgur.com/a/uMtD2 (xpub6CKq5V...)
If it is the same as the one we got by typing in the 12 words to blockchain.info then, yes we have duplicated that result. If the same 12 words produce a different xpub then that would be a bug.
The problem is that since the 12 words you get from your blockchain.info account produce xpub6CKq5V... (I think you will find this to be true again) you do not have, or have not found, the 12 words that produce the other xpub xpub6CVUkj... which is the one you need to produce the bitcoin address 1Masr1mezkmAqhtWT9RsWzt2e21aYApco. So, you are stuck and you will never find the private key to own those Bitcoins held at the address 1Masr1mezkmAqhtWT9RsWzt2e21aYApco until you get the 12 words or the xpriv/xpub key pair that produced that address.
If you import those 12 words (or the xpriv key produced from them) into any other wallet you will/should get the same result since one set of 12 words maps directly to only one xpriv key which maps directly to only one xpub key which maps directly to an exact sequence of private/public key pairs.
You will be able to see, when you type your 12 words into the site
https://dcpos.github.io/bip39/, the sequence of Bitcoin addresses and corresponding private keys produced by those 12 words by scrolling down to Derived Addresses. It will show you the first 20 but you can get the next 20, and the next 20, and the next 20 for as long as you want to press the next 20 button.
You can verify all of this by checking the first 20 addresses produced at
https://dcpos.github.io/bip39/ with the newest wallet you created at blockchain.info with your same 20 words. Just press the new address button in your latest wallet 20 times. It will create the same 20 Bitcoin addresses.